@book{28905,
	author = {Lovering, T. S. and Tweto, Ogden,},
	title = {Geology and ore deposits of the Boulder County tungsten district, Colorado,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1953.},
	address = {Washington,},
	note = {Part of the illustrative material is folded, part colored, part in pocket.}
}